ISO/ISL series isolated switches from the ATC Diversified Electronics Division of Marsh Bellofram are a family of multi- channel devices used to provide a safe and reliable means of controlling loads from hazardous locations without releasing sufficient energy, under normal or abnormal conditions, to cause ignition of a flammable or combustible atmospheric mixture while in its most easily ignited concentration. An isolated output turns on when the control switch input from the hazardous location is closed. When the control switch input opens, the isolated output turns off. The Style A single channel plug-in devices come equipped with integral spring mating clips which secure the device to the base. The Style N, surface mounted enclosure is sealed with a high quality epoxy resin material and has five (5) #8-32 screw terminals. Available in models offering up to four channels, the ISO/ISL series is available with choice of latching or non-latching version. Housed in the Style E surface mounted enclosure, multi-channel isolated switches are available in 24 VAC or 120 VAC control voltages. The Marsh Bellofram ISO/ISL series has been tested and approved for listing under Underwriters Laboratories (UL) UL913, intrinsically safe apparatus and associated apparatus. The input(s) to these switches have been approved for use in all classes, groups and divisions of hazardous locations.